Numerical Ability Reviewer - Part 23

Practice 20 Numerical Ability questions for the Civil Service Exam (CSE), each with the correct answer and an explanation.

20 questions80% passing markFree

Part 23 of our Numerical Ability reviewer has 20 practice questions in the style of the Civil Service Exam. Answer them in order, read the explanation after each one, and check your score against the 80% passing mark at the end. Questions and choices are reshuffled every time you retake the part.

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Sample questions from Part 23

Here are a few questions from this part. Take the full test to answer all 20 and get your score.

Sample question 1

In a Science class, the final grade is computed as follows: Quizzes 20%, Project 30%, Exam 50%. Andres got 80 in the quizzes, 40 in the project and 40 in the exam. What is Andres's final grade?

  • 50
  • 54
  • 53.33
  • 48
Answer: 48
Weighted mean = (80×20 + 40×30 + 40×50) ÷ 100 = 4800 ÷ 100 = 48. (The plain average 53.33 ignores the weights.)

Sample question 2

The numbers of trees planted by 7 barangay volunteers are: 20, 8, 27, 17, 23, 34, 11. If every value is multiplied by 2, what is the new mean?

  • 39
  • 20
  • 40
  • 22
Answer: 40
Original mean = 140 ÷ 7 = 20. Multiplying every value by 2 multiplies the mean by 2: 20 × 2 = 40.

Sample question 3

The number of customers who visited a sari-sari store over 6 days were: 36, 45, 50, 56, 20, 76. What is the range?

  • 56
  • 58
  • 76
  • 20
Answer: 56
Range = highest − lowest = 76 − 20 = 56.

Sample question 4

The weights (in kg) of 5 sacks of rice are: 56, 52, 60, 57, 50. What is the mean?

  • 275
  • 60
  • 56
  • 55
Answer: 55
Mean = sum ÷ number of values = 275 ÷ 5 = 55.

Sample question 5

The numbers of trees planted by 8 barangay volunteers are: 9, 8, 12, 9, 7, 18, 5, 15. What is the mode?

  • 9
  • 10
  • 6
  • 18
Answer: 9
The mode is the value that appears most often. 9 appears 2 times, more than any other value. Mode = 9.

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